Question

It Tana=5/12
then find Cos2a​

Answer 1

Answer:

Tan A = 5/12

P/B= 5/12

by Pythagoras theorum

AC SQUARE= AB SQUARE+ BC SQUARE

AC SQUARE= 12 SQUARE+ 5 SQUARE

AC Square= 144+ 25

AC SQUARE= 169

AC=

$\sqrt{169}$

AC= 13CM

cos A = B/H

= 12/13